https://github.com/jacobsjo/snowcapped/blob/4ce7d2e1d3879b495111d331dca68b3fe83a0b2f/src/main/BuilderData/SimpleSpline.ts#L80 'a' between -0.6666667 and 0. So a - 0.6666667 will be between -1.3333337 and -0.6666667.
snowcapped/src/main/BuilderData/SimpleSpline.ts
Line 80 in 4ce7d2e
'a' between -0.6666667 and 0. So a - 0.6666667 will be between -1.3333337 and -0.6666667.